There are two keywords available in Kotlin—var and val. The var keyword declares a mutable data type and the val keyword declares an immutable or read-only variable.
Declaring a variable in Kotlin
by Igor Kucherenko, Abid Khan
Hands-On Object-Oriented Programming with Kotlin
- Title Page
- Copyright and Credits
- Dedication
- Packt Upsell
- Contributors
- Preface
- Getting Started with Kotlin
- Technical requirements
- Introduction to Kotlin
- Data types in Kotlin
- Null safety, type casting, Pair, and Triple
- Flow controls
- Introduction to loops 
- What is a function?
- Summary
- Questions
- Further reading
- Introduction to Object-Oriented Programming
- The Four Pillars of Object-Oriented Programming
- Classes - Advanced Concepts
- Data Collection, Iterators, and Filters
- Technical requirements
- Range
- Arrays 
- Lists in Kotlin
- Filters and collection functions
- Summary
- Questions
- Further reading
- Object-Oriented Patterns in Kotlin
- Coroutines - a Lightweight Thread?
- Interoperability
- Regular Expression and Serialization in Kotlin
- Exception Handling
- Testing in Object-Oriented Programming with Kotlin
- Assessments
- Other Books You May Enjoy
Declaring a variable in Kotlin
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